Locomotive achieves a 90 percent reduction in Nitrogen Oxide emissions Progress Rail, a Caterpillar Company, and Norfolk Southern Corporation (NYSE: NSC) have collaborated on the first EMD GP34ECO locomotive built for yard and intermediate operations. The locomotive is currently undergoing testing to meet the U.S. Environmental Protection Agency Tier 4 emissions certification requirements – the highest emission standard for locomotives. Compared to older locomotives, the GP34ECO achieves a 90 p
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